if its sitting at 100 while the car is running and ac turned on then you must relieve the pressure. constant high pressure will eventually cause the clutches to fail on the compressor.

*note*, when refilling r134-a, the can should be in the UPSIDE DOWN position. the reason is you want it to enter the system in liquid form not in gas form. you will get a colder charge and lower psi readings this way.

 

I need to release some refrigerant too. Should the engine be running or should it be off when I do this? If it should be on, should the AC be on or off? Thanks!

 

Try reading the thread instead of just posting in it.

I'll help you out. Your answer is somewhere in the first 10 posts.

 

Unless you have an A/C manifold gauge, an A/C vacuum pump and a refrigerant recovery tank, don't do this at home. Just pay the $100 and get a professional to inspect and re-charge your A/C system.

 

post earmarked for later. ill try this later. let you all know how it turned out and what i bought

 

How is it that no one has mentioned that AC systems are charged by WEIGHT not by pressure, and the refrigerant capacity is conveniently one bottle of refrigerant. Not even in the FSM does it mentioning servicing the AC charge via pressure. It can be used to diagnose other things, but the charge is determined by weight not pressure.

Proper procedure is always to vacuum the system down into a recovery tank using a pump and manifold, then recharging with refrigerant by weight

 

I have, in other threads, and I'm sure lots of damage has been done (along with poor performance) by guys servicing their A/C without following proper procedures. It's encouraged, though. by the auto parts stores selling recharge kits that make the task too easy. At the very least, an open system should have its leaks repaired and be vacuumed down before any charge is installed.

 

Absolutely